SRAM Post Mount Disc Brake Adapter - Thunder Mountain Bikes
SRAM Post Mount Disc Brake Adapter - Thunder Mountain Bikes
SRAM Post Mount Disc Brake Adapter - Thunder Mountain Bikes
SRAM Post Mount Disc Brake Adapter - Thunder Mountain Bikes

Disc Brake Adapter (SRAM)

SKU: 00.5318.007.005

Regular price $27.00 Sale price$20.99
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+


SRAM post mount disc brake adapters allow you to run your preferred rotor size.  Standard mounting hardware is included.

+20mm Disc Brake Adapter

  • 140mm post, 160mm rotor
  • 160mm post, 180mm rotor
  • 180mm post, 200mm rotor

+40mm Disc Brake Adapter

  • 140mm post, 180mm rotor
  • 160mm post, 200mm rotor
  • 180mm post, 220mm rotor

Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right part the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!


We currently offer both economy and expedited shipping options though FedEX and USPS. 

Orders totaling over $49 are eligible to ship for free via an economy ground option of our choice. 

If you're in need of something super-quick, please contact us directly. We may be able to overnight your order with an additional fee and depending on your location. 


Should there be an issue with the item you bought, or you no longer need your purchase, we will be happy to set up a return.

Returns or exchange requests for New or Used Bikes must be requested by emailing us at within fifteen (15) days from the date of delivery. Bikes must be in un-ridden condition. Custom-built bikes may not be returned. Returned bikes have a $200 restocking fee and the customer pays for return shipping.

Returns for most other items may be requested within sixty (60) days of the delivery date. All returned items must be received in new, unused, and uninstalled condition, with the original tags and labels attached and in the original packaging. We cannot accept returns on any items installed or show wear of any kind. 

Clearance and open-box items may not be returned. 


To request a return, please log in to your customer account by clicking the  customer account icon  Profile icon in the top right of any page or visit

1. In the Email field, enter your email address and click Continue.

2. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.

3. Go back to the online store and enter a six-digit verification code to log in.

4. Find and click on the order that you want to submit a return for.

5. If your order has more than one item, select only the items you want to return.

6. Select a return reason and add a note for the store if needed.

7. Click Request Return.

Once your return request is approved, you will receive an email with shipping instructions and a return shipping label. 


We will process your return after we receive your returned item(s) and inspect the condition. Please allow at least seven (7) days from the receipt of your item to process your refund. We will notify you by email when your return has been processed.


If you receive defective or damaged products or if we sent you the wrong products, please contact us using the phone number or email below.


If you have any questions concerning our return policy, please contact us at:

(928) 282-1106   |

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Customer Reviews

Based on 5 reviews
Daniel Sykes
Quality product

Installation of the sram disc brake adjustment shim was performed with ease. It came with different hardware to install in various installations. Very happy with the upgrade from 160 to 180 mm rotors .

So far so good

Quality adapter, bolts, and cps washers. Everything fits perfectly. Thunder Mountain's customer service is top notch.



Zac Olson
Work as advertised!

Wow! These disc brake adapters were the exact component I needed to enhance the overall aesthetics of my bike. Yeah they were a necessary add for larger rotors, but dang, their is nothing like adding a pop of flat black. Seriously, buy these, you will not regret it. Unless you get the wrong size...don't do that.

40mm brake adapter is great

Ordered a SRAM 40mm disk brake adapter to increase my rear disk from 180mm to 200mm. Ordering was fast and simple and part arrived quickly. Adapter install was wicked easy. Thunder Mountain Bikes are fantastic!